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Artículos de revistas sobre el tema "LaScO3"

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Autor: Grafiati

Publicado: 6 de septiembre de 2023

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1

Гущина, Е. В., М. С. Дунаевский y Д. А. Малых. "Исследование трибоэлектрических зарядов в тонких диэлектрических и полупроводниковых пленках методами сканирующей зондовой микроскопии". Физика и техника полупроводников 56, n.º 7 (2022): 711. http://dx.doi.org/10.21883/ftp.2022.07.52765.20.

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Abstract SPM studies of triboelectric charges on thin films of high-k dielectrics LaScO3, semiconductor ”flakes“ MoSe2, and ferroelectric PZT films have been carried out. It is shown that the value of the accumulated triboelectric charge in these films depends on their thickness. The strongest effect is observed in the LaScO3 film 6 nm thick and the PZT film 100 nm thick. The dependence of the value of the measured triboelectric potential on the loading force and the material of the probe was also experimentally found.

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2

NOMURA, K. "Proton conduction in doped LaScO3 perovskites". Solid State Ionics 175, n.º 1-4 (noviembre de 2004): 553–55. http://dx.doi.org/10.1016/j.ssi.2004.02.076.

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3

Gorelov, V. P. y A. Yu Stroeva. "Solid proton conducting electrolytes based on LaScO3". Russian Journal of Electrochemistry 48, n.º 10 (octubre de 2012): 949–60. http://dx.doi.org/10.1134/s1023193512100084.

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4

Yugami, Hiroo, Hisashi Kato y Fumitada Iguchi. "Protonic SOFCs Using Perovskite-Type Conductors". Advances in Science and Technology 95 (octubre de 2014): 66–71. http://dx.doi.org/10.4028/www.scientific.net/ast.95.66.

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High temperature solid oxide fuel cells (SOFCs) have high efficiency and low emissions and contribute to the saving of the fossil fuel and the decreasing of the CO2 emission bringing about the global warning. As concerned about the development of electrolytes, oxide-ion conductors alternative to yttria-stabilized zirconia (YSZ) such as doped CeO2, Sc-SZ and perovskite-type oxides (LaGaO3) etc. have been reported to apply to the intermediate temperature SOFCs (IT-SOFCs).Some of perovskite-type oxides shows high proton conductivity at high temperature and are expected to the electrolyte materials for IT-SOFCs. In this paper we have investigated review the mixed electrical conductivity and the optical absorption spectrum of OH(D)-vibration of LaScO3.We also evaluated its applicability to the electrolyte material for IT-SOFCs by testing the SOFC performance of Pt/LaScO3/Pt single cell configuration.

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5

Fisher, Craig A. J., Ayako Taguchi, Takafumi Ogawa y Akihide Kuwabara. "Structural phase transitions of LaScO3 from first principles". Materials Today Communications 26 (marzo de 2021): 102048. http://dx.doi.org/10.1016/j.mtcomm.2021.102048.

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6

Edge, L. F., D. G. Schlom, S. Rivillon, Y. J. Chabal, M. P. Agustin, S. Stemmer, T. Lee et al. "Thermal stability of amorphous LaScO3 films on silicon". Applied Physics Letters 89, n.º 6 (7 de agosto de 2006): 062902. http://dx.doi.org/10.1063/1.2222302.

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7

Lybye, Dorthe y Nikolaos Bonanos. "Proton and oxide ion conductivity of doped LaScO3". Solid State Ionics 125, n.º 1-4 (octubre de 1999): 339–44. http://dx.doi.org/10.1016/s0167-2738(99)00194-0.

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8

Nomura, Katsuhiro y Hiroyuki Kageyama. "Neutron diffraction study of LaScO3-based proton conductor". Solid State Ionics 262 (septiembre de 2014): 841–44. http://dx.doi.org/10.1016/j.ssi.2013.09.018.

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9

LIU, J., F. IGUCHI, N. SATA y H. YUGAMI. "Optical absorption of Sr-doped LaScO3 single crystals". Solid State Ionics 178, n.º 7-10 (abril de 2007): 521–26. http://dx.doi.org/10.1016/j.ssi.2006.12.003.

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10

Lee, Kyu Hyoung, Hye Lim Kim, Shin Kim y Hong Lim Lee. "Phase Formation and Electrical Conductivity of Ba-Doped LaScO3". Japanese Journal of Applied Physics 44, n.º 7A (8 de julio de 2005): 5025–29. http://dx.doi.org/10.1143/jjap.44.5025.

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11

Durğun Özben, E., M. Schnee, A. Nichau, V. Mussmann, R. Lupták, J. M. J. Lopes, St Lenk et al. "LaScO3 as a higher-κ dielectric for p-MOSFETs". Microelectronic Engineering 88, n.º 7 (julio de 2011): 1323–25. http://dx.doi.org/10.1016/j.mee.2011.03.048.

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12

Nomura, Katsuhiro, Hiroyuki Kageyama, Kentaro Ohmi, Mitsuharu Fujita y Tetsuya Ueda. "Chemical Reactivities of LaScO3-based Perovskite Oxides and Platinum". Chemistry Letters 42, n.º 10 (5 de octubre de 2013): 1268–70. http://dx.doi.org/10.1246/cl.130550.

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13

Gorelov, V. P. y A. Yu Stroeva. "ChemInform Abstract: Solid Proton Conducting Electrolytes Based on LaScO3". ChemInform 44, n.º 1 (1 de enero de 2013): no. http://dx.doi.org/10.1002/chin.201301165.

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14

Galashev, Alexander Y., Dmitriy S. Pavlov, Yuri P. Zaikov y Oksana R. Rakhmanova. "Ab Initio Study of the Mechanism of Proton Migration in Perovskite LaScO3". Applied Sciences 12, n.º 11 (24 de mayo de 2022): 5302. http://dx.doi.org/10.3390/app12115302.

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The mechanism of proton motion in a LaScO3 perovskite crystal was studied by ab initio molecular dynamics. The calculations were performed at different temperatures, locations, and initial velocity of the proton. Different magnitudes and directions of the external electric field were also considered. It is shown that initial location and interaction between proton and its nearest environment are of great importance to the character of the proton movement, while the magnitude and direction of the initial velocity and electric field strength are secondary factors characterizing its movement through the LaScO3 crystal. Four types of proton-jumping between oxygen atoms are determined and the probability of each of them is established. Energy barriers and characteristic times of these jumps are determined. The probable distances from a proton to other types of atoms present in perovskite are calculated. It is shown that the temperature determines, to a greater extent, the nature of the motion of a proton in a perovskite crystal than the magnitude of the external electric field. The distortion of the crystal lattice and its polarization provoke the formation of a potential well, which determines the path for the proton to move and its mobility in the perovskite crystal.

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15

Farlenkov, Andrei S., Maxim I. Vlasov, Natalia M. Porotnikova, Ivan A. Bobrikov, Anna V. Khodimchuk y Maxim V. Ananyev. "Hydrogen diffusivity in the Sr-doped LaScO3 proton-conducting oxides". International Journal of Hydrogen Energy 45, n.º 43 (septiembre de 2020): 23455–68. http://dx.doi.org/10.1016/j.ijhydene.2020.06.148.

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16

Lehmann, J., R. Hübner, J. V. Borany, W. Skorupa, T. Mikolajick, A. Schäfer, J. Schubert y S. Mantl. "Millisecond flash lamp annealing for LaLuO3 and LaScO3 high-k dielectrics". Microelectronic Engineering 109 (septiembre de 2013): 381–84. http://dx.doi.org/10.1016/j.mee.2013.04.021.

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17

Zhao, Guowei, Kota Suzuki, Masaaki Hirayama y Ryoji Kanno. "Syntheses and Characterization of Novel Perovskite-Type LaScO3-Based Lithium Ionic Conductors". Molecules 26, n.º 2 (8 de enero de 2021): 299. http://dx.doi.org/10.3390/molecules26020299.

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Perovskite-type lithium ionic conductors were explored in the (LixLa1−x/3)ScO3 system following their syntheses via a high-pressure solid-state reaction. Phase identification indicated that a solid solution with a perovskite-type structure was formed in the range 0 ≤ x < 0.6. When x = 0.45, (Li0.45La0.85)ScO3 exhibited the highest ionic conductivity and a low activation energy. Increasing the loading of lithium as an ionic diffusion carrier expanded the unit cell volume and contributed to the higher ionic conductivity and lower activation energy. Cations with higher oxidation numbers were introduced into the A/B sites to improve the ionic conductivity. Ce4+ and Zr4+ or Nb5+ dopants partially substituted the A-site (La/Li) and B-site Sc, respectively. Although B-site doping produced a lower ionic conductivity, A-site Ce4+ doping improved the conductive properties. A perovskite-type single phase was obtained for (Li0.45La0.78Ce0.05)ScO3 upon Ce4+ doping, providing a higher ionic conductivity than (Li0.45La0.85)ScO3. Compositional analysis and crystal-structure refinement of (Li0.45La0.85)ScO3 and (Li0.45La0.78Ce0.05)ScO3 revealed increased lithium contents and expansion of the unit cell upon Ce4+ co-doping. The highest ionic conductivity of 1.1 × 10−3 S cm−1 at 623 K was confirmed for (Li0.4Ce0.15La0.67)ScO3, which is more than one order of magnitude higher than that of the (LixLa1−x/3)ScO3 system.

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18

Zhao, Guowei, Kota Suzuki, Masaaki Hirayama y Ryoji Kanno. "Syntheses and Characterization of Novel Perovskite-Type LaScO3-Based Lithium Ionic Conductors". Molecules 26, n.º 2 (8 de enero de 2021): 299. http://dx.doi.org/10.3390/molecules26020299.

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Perovskite-type lithium ionic conductors were explored in the (LixLa1−x/3)ScO3 system following their syntheses via a high-pressure solid-state reaction. Phase identification indicated that a solid solution with a perovskite-type structure was formed in the range 0 ≤ x < 0.6. When x = 0.45, (Li0.45La0.85)ScO3 exhibited the highest ionic conductivity and a low activation energy. Increasing the loading of lithium as an ionic diffusion carrier expanded the unit cell volume and contributed to the higher ionic conductivity and lower activation energy. Cations with higher oxidation numbers were introduced into the A/B sites to improve the ionic conductivity. Ce4+ and Zr4+ or Nb5+ dopants partially substituted the A-site (La/Li) and B-site Sc, respectively. Although B-site doping produced a lower ionic conductivity, A-site Ce4+ doping improved the conductive properties. A perovskite-type single phase was obtained for (Li0.45La0.78Ce0.05)ScO3 upon Ce4+ doping, providing a higher ionic conductivity than (Li0.45La0.85)ScO3. Compositional analysis and crystal-structure refinement of (Li0.45La0.85)ScO3 and (Li0.45La0.78Ce0.05)ScO3 revealed increased lithium contents and expansion of the unit cell upon Ce4+ co-doping. The highest ionic conductivity of 1.1 × 10−3 S cm−1 at 623 K was confirmed for (Li0.4Ce0.15La0.67)ScO3, which is more than one order of magnitude higher than that of the (LixLa1−x/3)ScO3 system.

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19

Liu, F. y G. Duscher. "Chemical composition changes across the interface of amorphous LaScO3 on Si (001)". Applied Physics Letters 91, n.º 15 (8 de octubre de 2007): 152901. http://dx.doi.org/10.1063/1.2798246.

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20

Ueda, Kazushige, Takuma Aoki, Yuhei Shimizu, Florian Massuyeau y Stéphane Jobic. "Luminescence and Location of Gd3+ or Tb3+ Ions in Perovskite-Type LaScO3". Inorganic Chemistry 57, n.º 15 (18 de julio de 2018): 8718–21. http://dx.doi.org/10.1021/acs.inorgchem.8b01288.

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21

Kumar, Sumit, Jyoti Kaswan, Biswarup Satpati, A. K. Shukla, Bhasker Gahtori, J. J. Pulikkotil y Anjana Dogra. "LaScO3/SrTiO3: A conducting polar heterointerface of two 3d band insulating perovskites". Applied Physics Letters 116, n.º 5 (3 de febrero de 2020): 051603. http://dx.doi.org/10.1063/1.5138718.

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22

KIM, In-Seon, Tetsuro NAKAMURA y Mitsuru ITOH. "Humidity Sensing Effects of the Layered Oxides SrO (LaScO3)n (n=1, 2, ∞)". Journal of the Ceramic Society of Japan 101, n.º 1175 (1993): 800–803. http://dx.doi.org/10.2109/jcersj.101.800.

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23

Liu, F. y G. Duscher. "Thermal annealing effect on the interface structure of high-κ LaScO3 on silicon". Applied Physics Letters 91, n.º 15 (8 de octubre de 2007): 152906. http://dx.doi.org/10.1063/1.2799177.

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24

Lybye, D. "Conductivity of A- and B-site doped LaAlO3, LaGaO3, LaScO3 and LaInO3 perovskites". Solid State Ionics 128, n.º 1-4 (febrero de 2000): 91–103. http://dx.doi.org/10.1016/s0167-2738(99)00337-9.

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25

Dwivedi, Sushmita, Tanvi Pareek, Manish Badole, Shadab Ali Ahmed y Sunil Kumar. "Effects of LaScO3 doping on structure, dielectric, and piezoelectric properties of K0.5Na0.5NbO3 piezoceramics". Journal of Applied Physics 127, n.º 9 (7 de marzo de 2020): 094104. http://dx.doi.org/10.1063/1.5141530.

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26

Plekhanov, М. S., A. V. Kuzmin, E. S. Tropin, D. A. Korolev y M. V. Ananyev. "New mixed ionic and electronic conductors based on LaScO3: Protonic ceramic fuel cells electrodes". Journal of Power Sources 449 (febrero de 2020): 227476. http://dx.doi.org/10.1016/j.jpowsour.2019.227476.

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27

Weng, Yakui y Shuai Dong. "Magnetism and electronic structure of (001)- and (111)-oriented LaTiO3 bilayers sandwiched in LaScO3 barriers". Journal of Applied Physics 117, n.º 17 (7 de mayo de 2015): 17C716. http://dx.doi.org/10.1063/1.4913637.

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28

Wang, M., W. He, T. P. Ma, L. F. Edge y D. G. Schlom. "Electron tunneling spectroscopy study of amorphous films of the gate dielectric candidates LaAlO3 and LaScO3". Applied Physics Letters 90, n.º 5 (29 de enero de 2007): 053502. http://dx.doi.org/10.1063/1.2437128.

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29

Balamurugan, Sarkarainadar, Ute Ch Rodewald, Thomas Harmening, Leo van Wüllen, Daniel Mohr, Heinz Deters, Hellmut Eckert y Rainer Pöttgen. "PbO / PbF2 Flux Growth of YScO3 and LaScO3 Single Crystals – Structure and Solid-State NMR Spectroscopy". Zeitschrift für Naturforschung B 65, n.º 10 (1 de octubre de 2010): 1199–205. http://dx.doi.org/10.1515/znb-2010-1004.

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Well-shaped small single crystals of the orthorhombic perovskites YScO3 and LaScO3 were grown from mixtures of the corresponding sesquioxides RE2O3 in PbO/PbF2 fluxes. Both structures were refined from single-crystal diffractometer data: GdFeO3-type, Pnma, a = 570.68(7), b = 789.3(1), c = 542.44(7) pm, wR2 = 0.0363, 448 F2 values for Y0.96ScO2.94, and a = 579.68(9), b = 810.3(2), c = 568.3(1) pm, wR2 = 0.0387, 513 F2 values for La0.94ScO2.91, with 32 variables per refinement. The 4c rare-earth sites of both perovskites show small defects which are charge-compensated by defects on both oxygen sites, leading to the compositions La0.94ScO2.91 and Y0.96ScO2.94 for the investigated crystals. The rare-earth sites have been characterized by 89Y and 45Sc magic-angle spinning (MAS) NMR. The 45Sc quadrupolar interaction parameters extracted from these spectra by simulations are found to be in good agreement with those obtained from DFT calculations of the electric field gradient.

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30

Stroeva, A. Yu, V. P. Gorelov, A. V. Kuz’min, V. B. Vykhodets y T. E. Kurennykh. "Effect of scandium sublattice defectiveness on ion and hole transfer in LaScO3-based proton-conducting oxides". Russian Journal of Electrochemistry 47, n.º 3 (marzo de 2011): 264–74. http://dx.doi.org/10.1134/s102319351103013x.

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31

Alekseev, P. A., M. S. Dunaevskii, E. V. Gushchina, E. Dürgun Özben, E. Lahderanta y A. N. Titkov. "Behavior of locally injected charges in high-k nanolayers of LaScO3 insulator on a Si substrate". Technical Physics Letters 39, n.º 5 (mayo de 2013): 427–30. http://dx.doi.org/10.1134/s1063785013050039.

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32

Elzbieciak-Piecka, K., M. Suta y L. Marciniak. "Structurally induced tuning of the relative sensitivity of LaScO3:Cr3+ luminescent thermometers by co-doping lanthanide ions". Chemical Engineering Journal 421 (octubre de 2021): 129757. http://dx.doi.org/10.1016/j.cej.2021.129757.

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33

Afanas’ev, V. V., A. Stesmans, L. F. Edge, D. G. Schlom, T. Heeg y J. Schubert. "Band alignment between (100) Si and amorphous LaAlO3, LaScO3, and Sc2O3: Atomically abrupt versus interlayer-containing interfaces". Applied Physics Letters 88, n.º 3 (16 de enero de 2006): 032104. http://dx.doi.org/10.1063/1.2164432.

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34

Balamurugan, Sarkarainadar, Ute Ch Rodewald, Thomas Harmening, Leo van Wuellen, Daniel Mohr, Heinz Deters, Hellmut Eckert y Rainer Poettgen. "ChemInform Abstract: PbO/PbF2 Flux Growth of YScO3 and LaScO3 Single Crystals - Structure and Solid-State NMR Spectroscopy." ChemInform 42, n.º 2 (16 de diciembre de 2010): no. http://dx.doi.org/10.1002/chin.201102004.

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35

Vlasov, Maxim I., Veronika M. Zainullina, Michael A. Korotin, Andrei S. Farlenkov y Maxim V. Ananyev. "Effect of proton uptake on the structure of energy levels in the band-gap of Sr-doped LaScO3: diffuse reflectance spectroscopy and coherent potential approximation calculations". Physical Chemistry Chemical Physics 21, n.º 15 (2019): 7989–95. http://dx.doi.org/10.1039/c9cp00539k.

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36

Kuzmin, A. V., A. S. Lesnichyova, E. S. Tropin, A. Yu Stroeva, V. A. Vorotnikov, D. M. Solodyankina, S. A. Belyakov et al. "LaScO3-based electrolyte for protonic ceramic fuel cells: Influence of sintering additives on the transport properties and electrochemical performance". Journal of Power Sources 466 (agosto de 2020): 228255. http://dx.doi.org/10.1016/j.jpowsour.2020.228255.

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37

Yang, H., P. Li, X. Fu, Z. Ye, X. Huo, Y. Wang, Q. Wu, H. Suo, L. Li y Z. Wang. "A novel blue emitting phosphor LaScO3:Bi3+ for white LEDs: high quantum efficiency, high color purity and excellent thermal stability". Materials Today Chemistry 26 (diciembre de 2022): 101050. http://dx.doi.org/10.1016/j.mtchem.2022.101050.

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38

Lopes, J. M. J., U. Littmark, M. Roeckerath, E. Durǧun Özben, S. Lenk, U. Breuer, A. Besmehn et al. "Isotopic labeling study of oxygen diffusion in amorphous LaScO3 high-κ films on Si(100) and its effects on the electrical characteristics". Applied Physics A 96, n.º 2 (27 de febrero de 2009): 447–51. http://dx.doi.org/10.1007/s00339-009-5153-y.

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39

Belova, Ksenia, Anastasia Egorova, Svetlana Pachina y Irina Animitsa. "Crystal Structure, Electrical Conductivity and Hydration of the Novel Oxygen-Deficient Perovskite La2ScZnO5.5, Doped with MgO and CaO". Applied Sciences 12, n.º 3 (24 de enero de 2022): 1181. http://dx.doi.org/10.3390/app12031181.

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This paper demonstrates the possibility of creating oxygen deficiency in perovskites A+3B+3O3 by introducing two types of cations with different charges into the B-sublattice. For this, it is proposed to introduce a two-charged cation, for example, Zn2+, as an alternative to alkaline earth metals. Previously, this possibility was demonstrated for aluminate LaAlO3 and indate LaInO3. In this article, we have focused on the modification of the scandium-containing perovskite LaScO3. The novel oxygen-deficient perovskite La2ScZnO5.5 and doped phases La1.9Ca0.1ScZnO5.45, La2Sc0.9Ca0.1ZnO5.45, and La2Sc0.9Mg0.1ZnO5.45 were obtained via a solid-state reaction process. Their phase composition and hydration were investigated by XRD and TGA + MS techniques. The conductivities of these materials were measured by the electrochemical impedance technique under atmospheres of various water vapor partial pressures. All phases crystallized in orthorhombic symmetry with the Pnma space group. The phases were capable of reversible water uptake; the proton concentration increased in the order of La2ScZnO5.5 < La2Sc0.9Mg0.1ZnO5.45 < La2Sc0.9Ca0.1ZnO5.45 ≈ La1.9Ca0.1ScZnO5.45 and reached ~90% hydration limit for Ca2+-doped phases. The total conductivities increased with the increase in the free lattice volume in the sequence of σLa2ScZnO5.5 < σLa2Sc0.9Mg0.1ZnO5.45 < σLa1.9Ca0.1ScZnO5.45 < σLa2Sc0.9Ca0.1ZnO5.45, the activation energy decreased in the same sequence. The sample La2Sc0.9Ca0.1ZnO5.45 showed the highest conductivity of about 10−3 S∙cm−1 at 650 °C (dry air pH2O = 3.5·10−5 atm). Water incorporation was accompanied by an increase in conductivity in wet air (pH2O = 2·10−2 atm) due to the appearance of proton conductivity. The sample La2Sc0.9Ca0.1ZnO5.45 showed a conductivity of about 10−5 S∙cm−1 at 350 °C (pH2O = 2·10−2 atm). A comparison of conductivities of obtained phase La2ScZnO5.5 with the conductivities of La2AlZnO5.5 and La2InZnO5.5 was made; the nature of the B-cation did not significantly affect the total conductivity.

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40

Laskari, Marina, Panagiota Preka-Papadema, Constantine Caroubalos, George Pothitakis, Xenophon Moussas, Eleftheria Mitsakou y A. Hillaris. "Coronal shocks associated with CMEs and flares and their space weather consequences". Proceedings of the International Astronomical Union 4, S257 (septiembre de 2008): 61–63. http://dx.doi.org/10.1017/s1743921309029093.

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AbstractWe study the geoeffectiveness of a sample of complex events; each includes a coronal type II burst, accompanied by a GOES SXR flare and LASCO CME. The radio bursts were recorded by the ARTEMIS-IV radio spectrograph, in the 100-650 MHz range; the GOES SXR flares and SOHO/LASCO CMEs, were obtained from the Solar Geophysical Data (SGD) and the LASCO catalogue respectively. These are compared with changes of solar wind parameters and geomagnetic indices in order to establish a relationship between solar energetic events and their effects on geomagnetic activity.

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41

Шмурак, С. З., В. В. Кедров, А. П. Киселев, Т. Н. Фурсова y И. И. Зверькова. "Эволюция спектральных и структурных характеристик боратов, образующихся при взаимодействии оксидов лантана и скандия с расплавом тетрабората калия". Физика твердого тела 65, n.º 5 (2023): 822. http://dx.doi.org/10.21883/ftt.2023.05.55501.35.

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The structure, morphology, IR spectra, as well as luminescence spectra and luminescence excitation spectra of europium-doped borates formed during the interaction of lanthanum and scandium oxides with a potassium tetraborate melt at 970°С with the general formula La0.99-xScxEu0.01BO3 were studied. It is shown that with an increase in the Sc3+ concentration, three compounds are successively formed: LaBO3, LaSc3(BO3)4, and ScBO3. At 0 ≤ x ≤ 0.26, the samples are single-phase and have the structure of LaBO3 aragonite. Within the range of 0.26 < x < 0.75, the samples are two-phase and contain the structures of LaBO3 aragonite and LaSc3(BO3)4 huntite. At 0.75 ≤ x ≤ 0.85, LaSc3(BO3)4 is observed. Within the range of 0.85 < x ≤ 0.97, the samples are two-phase and consist of LaSc3(BO3)4 huntite and ScBO3 calcite. At 0.97 < x ≤ 0.99, the ScBO3 samples have a calcite structure. Correspondence between the structure and spectral characteristics of these compounds was established.

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42

Shmurak S.Z., Kedrov V.V., Kiselev A.P., Fursova T.N. y Zver'kova I.I. "Evolution of the spectral and structural characteristics of borates formed during the interaction of lanthanum and scandium oxides with a potassium tetraborate melt". Physics of the Solid State 65, n.º 5 (2023): 789. http://dx.doi.org/10.21883/pss.2023.05.56052.35.

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The structure, morphology, IR spectra, as well as luminescence spectra and luminescence excitation spectra of europium-doped borates formed during the interaction of lanthanum and scandium oxides with a potassium tetraborate melt at 970oC with the general formula La0.99-xScxEu0.01BO3 were studied. It is shown that with an increase in the Sc3+ concentration, three compounds are successively formed: LaBO3, LaSc3(BO3)4, and ScBO3. At 0≤ x≤ 0.26, the samples are single-phase and have the structure of LaBO3 aragonite. Within the range of 0.26<x<0.75, the samples are two-phase and contain the structures of LaBO3 aragonite and LaSc3(BO3)4 huntite. At 0.75≤ x≤0.85, LaSc3(BO3)4 is observed. Within the range of 0.85<x≤0.97, the samples are two-phase and consist of LaSc3(BO3)4 huntite and ScBO3 calcite. At 0.97<x≤0.99, the ScBO3 samples have a calcite structure. Correspondence between the structure and spectral characteristics of these compounds was established. Keywords: phosphors for LEDs, rare earth orthoborates, X-ray diffraction analysis, IR spectroscopy, luminescence spectra.

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43

Pothitakis, George, Panagiota Preka-Papadema, Xenophon Moussas, Constantine Caroubalos, Constantine Alissandrakis, Panagiotis Tsitsipis, Athanasios Kontogeorgos y Alexander Hillaris. "Relation between coronal type II bursts, associated flares and CMEs". Proceedings of the International Astronomical Union 4, S257 (septiembre de 2008): 299–301. http://dx.doi.org/10.1017/s1743921309029457.

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AbstractWe study a sample of complex events; each includes a coronal type II burst, accompanied by a GOES SXR flare and LASCO CME. The radio bursts were recorded by the ARTEMIS-IV radio spectrograph (100-650 MHz range); the GOES SXR flares and SOHO/LASCO CMEs, were obtained from the Solar Geophysical Data (SGD) and the LASCO lists respectively. The radio burst-flare-CME characteristics were compared and two groups of events with similar behavior were isolated. In the first the type II shock exciter appears to be a flare blast wave propagating in the wake of a CME. In the second the type II burst appears CME initiated though it is not always clear if it is driven by the bow or the flanks of the CME or if it is a reconnection shock.

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44

SU, WEITAO, QIUHUI ZHUANG, DEXUAN HUO y BIN LI. "DIELECTRIC AND INTERFACE STABILITY OF LaSmO3 FILMS". Surface Review and Letters 19, n.º 06 (27 de noviembre de 2012): 1250064. http://dx.doi.org/10.1142/s0218625x12500643.

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The continuous downscaling of metal oxide semiconductor field effect transistors (MOSFET) on silicon, germanium, GaAs , etc. still demands the creation of new high-k dielectrics with even better material performance. In this research, a new ternary high-k dielectric film, LaSmO3 , is deposited using electron-beam evaporation. The structure and high temperature interfacial thermal stabilities are investigated by X-ray diffraction (XRD), X-ray photon electronic spectra (XPS), infrared attenuated total reflection (ATR) and time of flight second ion mass spectroscopy (ToF-SIMS). The band gap and band offset are determined using the O 1s energy loss spectra and valence band difference between film and substrate, respectively, from the XPS spectra. Capacitance-voltage (CV) and current-voltage (IV) curves are measured to give an insight of the dielectric and leakage current of this material. It is found that crystallization temperature of LaSmO3 is >1000°C. The high dielectric constant (k) = 24.6, large band gap (Eg) > 7 eV and low leakage current (1.8 × 10-4 A/cm2, 1 MV/cm) make LaSmO3 to be a promising high-k candidate.

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45

Georgiev, Mladen, Milko Borissov y Alexander Vavrek. "Vibronic pairing mechanism in LaSCO". Physica C: Superconductivity and its Applications 162-164 (diciembre de 1989): 1519–20. http://dx.doi.org/10.1016/0921-4534(89)90801-0.

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Mathieu, C., A. Llebaria y P. Lamy. "The LASCO database at LAS". Vistas in Astronomy 39, n.º 1 (enero de 1995): 109–10. http://dx.doi.org/10.1016/0083-6656(95)00058-u.

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47

Cliver, E. W. y D. F. Webb. "LASCO Data Dazzle Chapman Conference". Eos, Transactions American Geophysical Union 78, n.º 10 (1997): 107. http://dx.doi.org/10.1029/97eo00069.

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48

Gopalswamy, N., S. Yashiro, G. Michalek, G. Stenborg, A. Vourlidas, S. Freeland y R. Howard. "The SOHO/LASCO CME Catalog". Earth, Moon, and Planets 104, n.º 1-4 (16 de enero de 2009): 295–313. http://dx.doi.org/10.1007/s11038-008-9282-7.

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49

Takano, Atsushi, Yusuke Nakamura y Yataro Daigo. "Identification of LASEP3 as a new serological and prognostic biomarker for lung and various type of cancer." Journal of Clinical Oncology 30, n.º 15_suppl (20 de mayo de 2012): e13565-e13565. http://dx.doi.org/10.1200/jco.2012.30.15_suppl.e13565.

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e13565 Background: Identification of early cancer detection and prognostic biomarkers is urgently required to improve clinical outcome. Methods: We have screened cancer biomarkers using a strategy as follows; i)To identify up-regulated genes in non-small cell lung cancers (NSCLCs) using the cDNA microarray representing 27,648 genes and 120 lung cancers, ii) To verify the candidate genes for their no or low expression in 23 normal tissues by northern-blot analysis, iii)To validate clinicopathological significance of their protein expression by tissue microarray consisting of 259 lung cancers, iv) To verify whether they are essential for the growth of cancer cells by siRNA assay, and v) To measure their serum protein levels by ELISA in patients with various type of cancers. Results: We identified LASEP3 (Lung cancer Associated Serum Protein 3) encoding secreted protein as a candidate. Immunohistochemical analysis showed that LASEP3 was frequently over-expressed in various histological types of lung cancers; positive staining of LASEP3 was observed in 198 (54.8%) of 361 NSCLCs. In addition, a high level of LASEP3 expression was associated with poor prognosis of patients with NSCLC (p=0.0183 by log-rank test). Serum LASEP3 levels were higher in NSCLC patients than in healthy volunteers. The proportion of serum LASEP3-positive cases was 160 (61.8%) of 259 NSCLCs; 131 (63.6%) of 206 ADCs and 29 (54.7%) of 53 SCCs, while 6 (5.5%) of 109 healthy volunteers were falsely diagnosed. Serum LASEP3 levels were significantly higher in breast and colon cancer patients than in healthy volunteers, and tissue LASEP3 protein was overexpressed in breast and colon cancer tissues. Furthermore, treatment of lung cancer cells with siRNAs against LASEP3 suppressed its expression and resulted in growth suppression of cancer cells. Induction of exogenous expression of LASEP3 promoted cell mobility in vitro. We found a 50-kDa receptor (LASEPR) which interacts with LASEP3 on cancer cell surface, suggesting that LASEP3 is an autocrine/paracrine growth factor. Conclusions: LASEP3 is a potential target for the development of diagnostic and prognostic biomarkers for lung and various types of cancers

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50

Lago, A. Dal, R. Schewenn, G. Stenborg, W. D. Gonzalez, A. L. C. de Gonzalez, L. E. A. Vieira, E. Echer, F. L. Guarnieri y N. J. Schuch. "Deceleration observed in the coronal mass ejection event of July 25, 1999". Geofísica Internacional 43, n.º 1 (1 de enero de 2004): 41–45. http://dx.doi.org/10.22201/igeof.00167169p.2004.43.1.212.

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En el presente trabajo presentamos diagramas altura-tiempo de la eyección de masa coronal tipo halo observada en julio 25, 1999 con el Coronógrafo Espectroscópico y de Gran Ángulo (LASCO), a bordo del satélite Observatorio Heliosférico y Solar (SOHO), que puede observar la corona solar de 2 a 32 radios solares. Para obtener estos diagramas se usó una técnica en la cual se dividen las imágenes de LASCO en rebanadas angulares y se coloca lado a lado la misma imagen en diferentes tiempos de observación. Con este método pudimos identificar una pequeña desaceleración de la eyección cerca del polo sur solar.

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